Spring-pressure regulator for pumps.



No. 888,803. PATENTED MAY 26, 1908. L. W. HASKELL, W. G. PETTY & E. L. TESSIER. SPRING PRESSURE REGULATOR FOR PUMPS.

APPLICATION FILED MAR.15, 1907.

WITNESSES UNITED STATES PATENT oEEioE.

LOUIS W. HASKELL, OF NEW YORK, N. Y., WALTER C. PETTY, OF SAVANNAH, GEORGIA, AND EUGENE L. TESSIER, OF CHARLESTON, SOUTH CAROLINA.

SPRING-PRESSURE REGULATOR FOR PUMPS.

Specification of Letters Patent.

Patented May 26, 1908.

Application filed March 15, 1907. Serial No. 362,459.

and useful Improvements in Spring-Pressure Regulators'for Pumps, of whic 1 the following is a specification.

This invention relates to regulators for pumps and particularlypumps for pumping iquids such as oil. 8

One object of the invention is to provide a regulator of simple and durable construction which may be readily applied to pumps of dillerent types and b means ofwhich the supply of liquid furmshed by such pumps, acting under varying pressures, is elliciently controlled.

A further obj ect of the invention is to furnish a pump-regulator which acts as a reservoir to receive more or less of the liquid according to the pressure existing in the pumpcylinder and to force the liquid back upon the .piston during-the return-stroke, whereby the iquid is prevented from being discharged from the ump through the discharge-pipe, or throng a relief-valve, as hasbeen customary.

A further object is to automatically develop a gradually increasing hydraulic pressure (as in the cylinder of a hydraulic press) by gradually decreasing the quantity of liquid delivered to the press cylinder while the pressure of such liquid is simultaneously increased.

With these ends in view the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.

The accompanying drawing shows in elevation and artly in-section a two-cylinder press-pump having two of my improved regulating devices applied'thereto, one to each.

cylinder.

In the drawing reference numeral 1 indicates the pump'cylinders and 2 the istons which reclprocate in said cylinders t rough stuffing-boxes 3.

4 is the check-valve of the usual construction by means of which the liquid is forced under pressure from one cylinder to the discharge-pipe 5, common to both cylinders.

The improved regulator comprises a regulator-cylinder 6 which extends at right angles to the pum )-cylinder 1 and comm'unicates therewith y means of a short-pipe 7 threaded into both cylinders. The capacity of the regulator cylmder is -made equal to that of the pump-cylinder in order that the former cylinder may, if required, receive all the liquid from the latter; Within the regulator-cylinder 6 there is a piston 8 movable in upward and downward direction through a stufi'ing-box 9 at the upper end of said cylinder. The cylinder 6 is formed at its u per end with laterally extending )erforated ugs 9 in which are secured parallel upright rods 10. Said rods are threaded at their upper ends and they are connected by a cross-piece 11 movable freely in vertical direction on said rods and adjustable thereon by means of nuts 12. The regular piston 8 is threaded at its upper end into a crosshead 15 guided on the rods 10. Secured to and extending upwardly from said crosshead 15 is a spindle 13 passing freely through an opening in the crossiece 11 so as to be guided in the latter. A helical spring 14 embraces the spindle 13 between the cross-piece 11 and the crosshead 15 and normally holds the piston in its lowermost position in which it completely fills the regulator-cylinder. The compression of the .sprmg may obviously be adjusted by means ressure, the oil or other spindle and interposed between said collar and said cross-piece. The tension of the sging 17 may be regulated by means of nuts 18 t eaded on the spindle above the collar 16 and bymeans of which the latter is held on said spindle. For the same pur ose above indicated the piston 8 is cushioned by a dashpot. This dash-pot is preferably formed by making the nut or gland 19 of the stul'ling box 9 of cup-shape so as to form a dash-pot cylinder and providing the piston 8 with a dashpot piston 20 designed to fit within said nut or g and. This piston 20 is preferably cylindrical in form, as shown, and threaded on the upper end of the regulator piston, so as to be vertically adjustable thereon. By this arrangement the position of the dash-pot piston may be readily made to correspond with that of the stufling-box nut. In some cases the cushioning spring 17 or the dash pot may be omitted, but it is always preferable to employ at least one of these cushioning devices.

The operation of the regulator is as follows: Supposing the pump to be operating at alow iquid is sucked rom the source of supply into the ump cylinder 1 upon the outstroke of tie piston. During the instroke or compression stroke of the iston the oil is discharged through the chec valve 4 and thence into the discharge pipe 5. Under these conditions the pressure within the pump-cylinder is not sufficient to affect the regulator-spring 14 which retains the regulatoriston in its normal or closed position, and a the oil is discharged. How'- ever, upon a predetermined increase of the pressure the action of the regulator-spring will be overcome and the regulator-piston will be forced upwardly to a greater or less extent, depending on the pressure, thus allowing thecorresponding amount of the oil to ascend, under the action of the pumppiston, into the regulator-cylinder, instead of being discharged through the valve 4 into the discharge-pipe. Upon the return-stroke of the pump-piston the spring will return to its normal position and the oil will be permitted to flow back into the pum -cylinder, as will be understood. Accor ingly the next charge of oil which is sucked into said cylinder will be. diminished in quantity by an amount corresponding to that which, entered and flowed back from the regulator-cylinder, or, in other words, will be equal to the amount which was forced out into the discharge-pipe. When the pressure is still further increased the spring will be compressed to such an extentthat the regulator-cylinder will be entirely filled with oil and will take up all the oil from the pum -cylinder, the capacity of said-cylinders eing the same, as

before explained. Thus no oil wh atever will esca e to the discharge-pipe. stro e of the piston this oil will-flow back into the pump cylinder as before and in so movin back and forth the power of the pump-1s taken u by thecompression of the spring instead 0 delivering 011. When the pressure is reduced there is a corres ondmg reduction of the amount of oil taken into the regulator-cylinder,- and hence vthe oil will again begin to be forced out through the d15- char e-pipe. Thus the regulator reduces the ow of oil u on predetermined increases in pressure and proportionally to such increases, and when a certain high pressure is reached, cuts off the supply entirely. The regulator is adjusted to these pressures by means of the nuts 12, as already pointed out. It is obvious that the pumping-piston and regulator-piston do not necessarily have the same amplitude of movement. When the pump-piston has a very long stroke and 1t is desired to use a spring having a short movement this can be done by increasing the area of the regulator-cylinder and piston and proportionately decreasing their length, as w1ll be understood.

The improved regulator may be applied, if desired, to the discharge-pipe instead of to the pump-cylinden In this case the d18- charge check-valve in the pump must be removed and a,,check-valve placed in the discharge-pi e at a point beyond the regulatlng devicet at is to say, between the regulating device and the press or other mechanism to which the oil 1s to be supplied. Thls change of the check-valve is made,necessary by the fact that the pump-cylinder and regulating device must deliver oil to each other in both directions.

The improved regulator may be very readily applied to any pump and 15 very simle in construction and efiective 1 n operation. urther, the device may be readlly ad 1usted, this adjustment being possible while the pump. is in operation. 0

Having thus described my invention,- I claim:

1. The combination with a pump cylinder and a pump piston therein, of a regulator cylinder, a reciprocating piston therein, a stufling box throng};1 which said piston passes into said cy der and which emodies'a gland forming a dash-pot cyhnder, a dash-pot piston carried by. said regulator piston, and a spring acting on said regulator piston to normally hold the same in positlon. 2. The combination with a pump cylinder and a pump lator cylinder, a stuffing-box through which said piston passes into said cylinder and On the returnpiston therein, of a regulator cylinder, a reclprocatory piston 1n sa1d reguwhich embodies a nut orjgland forming a dash-pot cylinder,- a dash-pot piston carried .by said regulator piston and arranged to fit Within the cup-shaped nut when the regulator piston is at the limit of its inward movement.

3. A regulator for pumps, comprising a regulator-cylinder adapted for attachment to the pump-cylinder, a reciprocatory piston in said regulator-cylinder} a stufling-box through which said piston passes into said cylinder and which embodies a cu -shaped nut or gland forming adash-pot cy inder, a dash-pot-piston. carried by said regulator piston and arranged to fit within said cupshaped nut when the regulator-piston is at the limit of its inward movement, and a spring acting on said regulator-piston to normally hold the same in the aforesaid position.

Signed at New York, N. Y., Mar. 12, 1907. LOUIS W. HASKELL. Savannah, Ga, Feb. 16, 1907. v WALTER C. PETTY.. Memphis, Tenn:, Feb. 4, 1907., a

E. L. TESSIER. k ylvitnesses to signature of Louis W. Has- 4 EDW. E. CoLEs,

W. A. CONKLIN. Witnesses to Walter C. Petty:

THos. H. MAXWELL, H. V. WILLIAMS. Witnesses to E. L. Tessiers signature:.

' WM. A. TENNILLE, I

W. S. RANKIN. 

